原因：项目中JDK使用的版本与现在使用的JDK版本不同所致。
解决方法:右键选择项目》properties>java Build Path>Libraries 查看下面的JRE System Library 是不是有红色的提示。肯定有把，选择它。删除。。右边 Add Libraty 重新添加一个就好了
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